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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'e4e1faa4bdad17361ab5666175a92717abd9bf56517f12b3e041b9252e3cb40c' 
  AND token = 'ju1U3iZ/U1jzSxe4pl0XzrFw4u0ebN8P+8EK/QW+9VA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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