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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '6c9dc822e477ff89cfe4a286d18fe6f3244256fd0b6679585967145569a7badf' 
  AND token = '6wt1jVVtsj1bc21tVVpcoB5+pV8db/HoNLJtYxYWfVI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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