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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '5627fa7fafc01623ef50527a791398e7a0ae01a2fb718a0a39c5100eb08f173c' 
  AND token = 'Mm6p/0V+9G+3hEYUMqn5wtRtsPcktvgIM/PibRAAfaw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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