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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'e8c41d7c9aad0c193c424d69223d4a21cf98908be1466e49b275dbe510f0aa2f' 
  AND token = 'bBVC0Or332meiu1i8mpBoC5WMOGfaftmQ+euKHUWyuY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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