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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '6b26d29173b85813fe001b61cabb9dc1530534c96906cfcac705195758c2a21f' 
  AND token = 'a69OURt09oob9NYEGNK+XxVYSJOv5T3ivgtJbUINJbM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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