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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '384042ed4869275bc7f5b9543299811ae8033968f33e5b923c04e7cf83524e72' 
  AND token = 'eAm2mahFcDyKhGox/Fqtsg7Dft8DuRWmHLxNj6DXokc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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