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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '98821a3f7c87ed52c72c874070470e081a42198598cf4be98be8e4fdd8828a80' 
  AND token = 'F8fXKs5S5JF8het81PfPI4Od/9MTka48OouvfVpG4vU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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