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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '87300fadf418911e40a1b71b3a0b158eac260c01776696b8759edb68b96df593' 
  AND token = 'qydIhpTwKo1J85t0hRPQrn222A6MZxKakhRWxWwND64=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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