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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '47ebd4478a53bba83f914063373bee9a01f2a67ad749957cefc5a01486da5f54' 
  AND token = 'u8XpoRDXkaFZeDZsF0rQdlp2MGmd52iw71pWL/DtdEw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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