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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'f98714ec6602c4b74a78cdb6ec069e4d08478acb2cfcd62f54a44c3c27b27909' 
  AND token = '5qGGAUrPN1jbPozwgDtsVbhDTUMdA2nb6r9Ebi8ogjY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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