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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '5e54fb2d69c30439b15565ce18b1c6254457709e42bfae49e58b1d56996c85d9' 
  AND token = 'UC98TlZc/xy/NsJCST4v//j8X8pLUqPQ1dLvNIAEmuk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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