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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'aadd28f565cb292ae0ee5b5d73012443898e4d32fbfe334bb596b7103acc8ef3' 
  AND token = 'xtj6bvfQIG4tGZrDEH5W2divr56D6bf2oquYkkEE1LM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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