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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '5fa3f83af9dd124f9fa176c7d2b904424fb522ec07292d2844fc61e8df426cfc' 
  AND token = 'p4b6IajkaanrJmT+CNwqsM5JQXe3ax2Xui1THoJMd1Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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