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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '3de3bc6e8fd1a734628c13da2d71a5617ca529d46505cfc94694661c81da3b5a' 
  AND token = 'VWc1Ti1JWc/zg7kpQi8FTBwQYKfVNMot26qQTNXmARU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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