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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '9e03a7660e1226a0389b0d625e38ae307695b79adc1958e6c1d6e8ba4733e83f' 
  AND token = '4KboMSzW4T0HqYz8vBixRFabSjhCNdZ08IZs8vEyJRA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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