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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'f3248870abd8358aaa5bdee19f99b08f43ab535773a9a4c263889ad7aa4b569f' 
  AND token = 'RHwW5QyWGyxyND6UkFG2/6mBrx94Enrv2EjOsc1W2+M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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