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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '60d536970088a07474c8fd742b1c2231603d283c2f78b65cb6b541994fb98a38' 
  AND token = 'Kmd/c9C25xMTCb0sRtYcsbJhRUkemB7+lKPextkcGsY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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