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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '364d80bb26069bbea278ad65cc4acc3bd92be028e05a9ce4f70392164c6b37c2' 
  AND token = 'XlWxa8KYa3uFOiTlJyrPP+GctRC+oBojbm5zTtAt/S4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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