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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'c8dfd2a679d7391f7beb8dd38b4cbe7ed374f80f0d878e27392daff93b225c73' 
  AND token = 'sVnE1hTTnR1s9U7Bt7aOBnZmAq5pnlPPjMS1hvCoqok=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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