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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '340c1e1db82e12489c09484b16f95fbdc60008f019632cd1c005c40b5847fb30' 
  AND token = 'NZkxkdGacDbqWHwh/BQi0qys9nT3WRqElHhfX/5jrng=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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