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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '96289cb227d609625d22cea6e45257d47d9e20569bb921a93b6c22b943d76eb8' 
  AND token = 'naCO85I2RamZmfcDrw6pkVklHWaqUiEebw22ZANe9fM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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