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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '76e49043bc517da2ea6a6f423d21c2335d1bb5bc077ca5522b314f70092c380d' 
  AND token = 'sN+Bj1QNkLP9cUxMpeWFUnoNhPr2fG4tulppR/SJaEM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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