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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'd2bd666744f019c19776cc38ee747160ae63029ef4a0d83da07b5d47e0c8f88c' 
  AND token = '64UObZeO8avoWymib0TPF3NC/DtCUiP3K107NWyIlSY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}