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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '3e70208e249c1d1ec11011834f0b64e8cce88c80922c4469ebce1aba080b9143' 
  AND token = 'XxNN+5Vqjg0omEpl5lt82i7LIhzwrPcyp6MQ94dBa8M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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