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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'a7fd706aad48cc081bcd2e6c88712a7970e35585a18418672b83afab7de93293' 
  AND token = 'Edgy90xIK0wckyd8unSB3xvB5RtZre2J6BwTcH9lJSw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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