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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '0c38bc1e61ac7920d762fb387342ebd9a31b5ebf76f92c25aaa4b5ccdc2f96f9' 
  AND token = 'TU5icEFnXehEbrMtc7R1qVD5Jj17XyQWuqmgvG7ah5I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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