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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '35542147262a4914782d68bfe67d8d007a07b8401eb79795da233b43dce7896a' 
  AND token = 'rYwusxa4RJvfRCQw2FSbypuYp7gL67yU5WM91B/CXew=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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