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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'af90a973caf44d0d1d54d4697bf3c44972e65ad456bbb94f1373466414efb1d9' 
  AND token = 'IV4zA1RPgGsMtsVMPOZ6p5BFaYl2o67B9QNNFEb52pQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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