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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '28e2b3ee88c1ac694e4e3d8863664c519dd426e756fc1be0a49c6b4190a3a306' 
  AND token = 'kV1tBnLzI+v9hOXseRz4z/yCKW9uamJSiuUsYur8utM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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