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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '14bf468ed5f7bfacb7a24783beee2768242dd53bed7ecf141df61d52d3e06ca6' 
  AND token = '1oDWC41QV8wmDZrPnT/ZjKpc8cl2/V7U/aIxsR1IWdQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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