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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '8657ce72d230e7e8e9c5ddcd9d2c0d0df0e8079e1eb0176db1b2e658e538e643' 
  AND token = 'uUls8EL/senclKdkq1WK+CxBRB76Yjpu78gFg/8oP+k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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