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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '28b2a00d112018d3c6a87017e19ae8eb79a6996bca58d8d8a867c0147185a8b4' 
  AND token = 'e+XxzzyUoVmLljOrEorl9w7XlRGorlfwoq1S1MFs9oY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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