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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '59fa78197a870c320813b7f107b992484b9b347a7513f2ff1b29c33812a92649' 
  AND token = 'Q1imC+rvw2QP2sjkw87+GeoEd8ZFka2feKJ8O+KVLHk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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