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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '228d92b2753e319bdb67bdb38246ddbecb6b27ec6bb855779aa515dceb8dad43' 
  AND token = '1McaxzkKvnBBK5iNKqM8u3fL5OmRVJUhc6diImTFUBo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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