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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '666409d1123b3f7706efc896216db064aa8bbb83f0bee394eb0cb61ed34431d5' 
  AND token = 'RJ5nIWpbTndor6Vmlvl1cv5FnZCRHKPGEzcEdTeQNNM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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