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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'df226cb6b400eff2b67bf5b35ac3546b44cd7b0adb81f55c45d791f28df88fe8' 
  AND token = 'Ya7YSajnz2JVH43cE7iSNzo9QxNei80e6dH4QcVc2aE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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