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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '762fc68bf71af5593fb7bb3223eab05a4a09c537ff4ec0c3c6ac6b13d7f9fa10' 
  AND token = '47sjYj0b+Ptj/1axTGNz6+qUshPYtFHk8fl2BNPrFfc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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