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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '00173b320809a37313bb6adf83cd4f9fa88c4dbf6e9b5c171c0be2158ee30c0b' 
  AND token = '4Fh9oLDcl8QdhxgrVeJrLqtP6P1z4NAoZIiG8cWDpGw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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