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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'd4dfd780dc449dfe686146cd49fd43e3e87942f4d34e8148e805c3ea4a08b4c3' 
  AND token = 'Cd64QhUrvlU7RlyVOxZVOKJSoLoXUD2aoMvkhQ1d1BI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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