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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '315bbaba87f0a316fbf82d80b6a1db53fa0971fd22f50a0f49c6caaac90fe9f7' 
  AND token = 'RdLWTUIcQLxTlMNVtE5y5+BvKEap35867hSmLtLsIpA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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