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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'cfe4d57bdb373041c36cbcd7095e7dba7f6239f69a0ece9dcba4ead7824ea2e8' 
  AND token = 'ZIUKIPw4BMopwndUABCZB76iZKqTeFSNFnNiDZK0KoI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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