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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'bdac1be79463d033595aadc5c214a5370d295eb44d5a37d5cd75775fbe02c1c8' 
  AND token = 'REGSStzNsQc+msWvf6LZKwvhqtrm7wKmQM8P9TNFaNk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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