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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'fa6a4be1caea40cd987801fe14bc57896594fd635eba122ed45a8f0a4c9085de' 
  AND token = 'To02dhOkayc7/+X4vcGa2CP6up2IeArDlX7r9z4T2EA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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