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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '634c2903c27458acc011cbf40cda833cc93557ca0043627177644531d79a5476' 
  AND token = 'goBMxn0Z6a+7xlxHReu5kibMbHc/C1TFJqENDXoDSow=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00052

JSON explain

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