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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '1c01e3a89487fdb0a491556a9c82304f5c2f0a86d59a952d52e9cf1106ee8497' 
  AND token = 'KV+Sg/V/A9FpN2jet4QfUAOsmLL6oDoc9ManvLXU1GU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00051

JSON explain

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