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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '9db6dbc283fa829a92ce2dc5a6c73ad76ffba4f5f9d292efc9e28bfcb761b90e' 
  AND token = 'ZbQiRfWi0fMLFAXs8PFEPHBaBbb1z4ua535LPT8XyhA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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