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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '70af35cda69648ed94102a0c4865372c48219f31ed8d6815b39f6e0ac31e1b5a' 
  AND token = 'caiUWevibo7PwThCPH7EQ14cWxi6mqj9YXiXzJVOkt4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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