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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'e70d02aa464c9d2a6230df048fcdf1fe8f2b6534b4603c95e1f8278e5138359b' 
  AND token = 'OaWWcla2yTTt96N/HOydTwBS4vQrZod7zz4IAd2tJQ0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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