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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '877e0236376c4b8fed10dd6b42907dc8493343e0860fcd1b92e36efdeff280c6' 
  AND token = 'AS03WUpKI5XbEd+5qYHmV0oYb0ylldZ085TVEe8Mii8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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