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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'fa68a1e4bf351226039738a8e48d173c95ea885bc18137258e6a13240b117729' 
  AND token = 't0oHhnH3ftgP6GGPe4osfXxe443TXD/d9dZaqPc1Atw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00248

JSON explain

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