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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'fc389846e17033a366c815ea52613ebc06a1755a8e59d661b9ccb7e868a63454' 
  AND token = 'zkuOk/fab80y6Q402PbFk24nxNWgPn9opvr7oI+KNIQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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