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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'c238f8ae7f1106cdcebc29d6b51f9c8018b9088c31d87d92bbc3a6e47bafb8f1' 
  AND token = 'a8vpKBOFXyQWzZScronI6xFmJ1bXaqgpwa6jMfqlS2U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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