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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '3fdfb7a8b4cf7d57db14d720dbd4ba4aea6e6e505e89b097e514638d846cfe56' 
  AND token = 'UsIvX0IsexETS88W6asZBxY/BntsGgRh4s66qpqKNqg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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