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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '79a3e745e4c479b5b56a9efed9e9fee4510cd729097e28b6f0dddcab4f689e00' 
  AND token = 's+3xk3a2yYSmzlrR+G6WJ35BfdrXKpPzM41xlTvptFQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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