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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'a454faf6e4fdb4a8a691852200b3b8137fbb1fa21c5631dee26af53aeded7a0a' 
  AND token = 'RtOiq19BLRIjw1iN38k/nNnNfF7fniT9waynESvnigk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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