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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '1fffbd9b98dca3cebd6f2e94298e9258cbdf8fd49ec55768be6478ffeddfc959' 
  AND token = 'snLZvNerrtmdpXzwSVWuRW1Z44nn0N6bj8pQMj2B6+M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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