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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '8bd73f1b7bc22c52a67a14f8176260255f51544ac05c141d4182254e2f0b8747' 
  AND token = 'yflCY5qUzq95uhif02bqUXVKuGxMbVR2WiXnXv1p6bA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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