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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'e87d64ab487433edd46b499a6329e173c4d07f7baf053898a827d985920d64ce' 
  AND token = 'C2PYewyyImn9+iB/zcE2h1f84VfQRU3Mf+HZ4X9E8O0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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