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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '9998113e503e386a5926e101a6da4aca5e4a38d6544242cc7fa7462f7b8cd465' 
  AND token = 'gchxgC8CPxbG085BamfZnfd+scW3dufgCYawLLcJdck=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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