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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '346fe5007ad2bcfc7df07f1774ab74e2dc1cbd87be1409bccfb0a0e5b5eaaaba' 
  AND token = 'LW3U74Uum/Hf8fKx937z9WkY99T92Uk0ehVbiMdt/VY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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