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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '827f5eb3a2ecd322abf31a72f2779fb62db0f1709ffd8e608d7908f08447c0bb' 
  AND token = 'g2ptSFCvlUmmXOHHxufPTt4dvnZU24YRiKuJvxvnvIE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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